The work of the scientist credited with the discovery of what he called "chiasmatypie" was continued by what American scientist? 
Thomas Hunt Morgan
-1
Section::::Abstract.
Frans Alfons Janssens
31701960
-1
Section::::Abstract.
Frans Alfons Janssens
31701960
-1
Section::::Abstract.
Frans Alfons Janssens
31701960
-1
Section::::Abstract.
Thomas Hunt Morgan
31522